The requirements surrounding Ruby Dragon are a prime example of an outdated concept for MMOs with a heavy reliance on RNG and the player's patience and perseverance.
The first requirement: The weather transition from Thunder to Clouds in the Ruby Sea.
This weather transition occurs less than a dozen times a month, with there being a total of maybe eight or nine for the month of August. That's extraordinarily limited for the "difficulty" of catching the fish, which I will address next. That is also just the windows themselves and not factoring if the player can make every single one of them considering they can be just about any time of the day, with many of them during the middle of the night or the middle of the day. For a game that leans towards a more casual approach to MMO'ing, that is something that leans completely the opposite direction.
The second requirement: The "difficulty"
There are several factors that make Ruby Dragon "difficult." The high escape rate of Ku'ers, that Ku'ers can bite themselves, the extremely low bite rate of The Ruby Dragon, and that The Ruby Dragon can escape as well.
When you put all this together, you get an extremely frustrating and defeating experience where the only component the player can rely on is little skill and a lot of patience and persistence. I understand the objective for Big Fishing is to have some challenge, but one that lasts for potentially months or years for some while others might get lucky and catch it in less, is not fun. I know of some people reporting they have attempted to catch this fish for over a dozen, two dozen, five dozen windows. (Please remember the limited number of windows per month, and then if they can make those windows.)
There needs to be an adjustment and future avoidance of significantly defeating criteria of Big Fishing. Personally, I would almost be okay with the distant windows if Ku'ers never escaped, because then you could use more Mooches for more chances to catch The Ruby Dragon. From experience, I average three Ku'ers over 20 minutes, not including any that get away. In the months I have spent seeking The Ruby Dragon and timing the bites with a stopwatch, I have never had a window go beyond 26 seconds. (Considering from my understanding and reports I have seen from others who have caught The Ruby Dragon saying that it bites starting around 30 seconds into a Cast.) It also is not that I have not had the patience for Big Fishing in general, I have caught almost all of the Big Fish in the game, including some of the more frustrating ones like Problematicus, Raimdellopterus, and Stethacanthus.
Something needs to be adjusted some of these Big Fish with their ridiculously distant windows and other requirements that make them unenjoyable.